Tubular magazine repeating firearm



Sept. 13, 1938. c. E. BLIZARD 2,129,729

TUBULAR MAGAZINE REPEATING FIREARM Filed April 11, 1935//////lllll/ll////,

II- kl -f s Patented Sept. 13, 1938 UETE SATES Maize ortica TUBULARMAGAZINE REPEATING FIREARM Application April 11, 1935, Serial No. 15,752

11 Claims. (Cl. 42-49) 'Ihis invention relates to improvement intubular-magazines repeating firearms and relates in particular to thetubular magazines thereof, and means for altering or regulating thecartridge-containing capacity of the latter.

One of the objects of the present invention is to provide atubular-magazine repeating firearm having superior means for altering orregulating the capacity of the tubular magazine thereof.

A further object is to provide convenient and effective means foraltering or regulating the cartridge-containing capacity of thetubularmagazineof a repeating firearm.

Another object is to provide simple, reliable and eiiective means forthe purpose referred to, which will require the use of a tool in orderto be shifted or removed, to thus minimize the chance of the firearmhaving its magazine ca pacity changed in the eld, in efforts to thwart thunting laws.

With the above and other objects in View, as will appear to thoseskilled in the art from the following, considered in conjunction withthe accompanying drawing and appended claims, the

a, present invention includes all features disclosed therein which arenovel over the prior art.

In the accompanying drawing:

Fig. 1 is a View in side elevation of a tubularmagazine repeatingiirearm in which the present I invention may be embodied;

Fig. 2 is a central longitudinal sectional view of the tubular magazineof such a firearm, showing the capacity-adjuster installed therein;

Fig. 3 is a front-end view thereof;

..1 Fig. 4 is a broken view in central longitudinal section of theportion of the tubular magazine adjacent the capacity-adjuster but shownon a larger scale than Fig. 2;

Fig. 5 is a similar view but showing the capacity-adjuster in section;

Fig. 6 is a transverse sectional View taken on the line 5 6 of Fig. 4;

Fig; '7 is a transverse sectional view taken on the line `I-'I of Fig.4;

Fig. 8 is a perspective view of the lockingroller; and

Fig. 9 is a broken view in side elevation of a rod-like tool suitablefor installing, adjusting and removing the capacity-adjuster from atubum; lar magazine.

For the purpose of illustrating the present invention, atubular-magazine repeating rearm is shown in the accompanying drawing,which nrearm includes in brief a receiver Ill, a buttstock I I,

55 and a barrel I2, beneath Which latter is mounted a tubular magazineI3, partly embraced by a forestock I4.

The tubular magazine, which is shown detached in Fig. 2, has projectingfrom its rear end a sleeve-like extension I5, which latter at its Vforward end extends part Way within the rear end of the magazine I3proper, to which it may be secured by brazing or the like, and providesa forwardly-facing annular stop-shoulder I E, against which acomplementary annular stopshoulder Il on a cup-shaped follower I8 abutswhen the magazine is empty.

The follower I8, above referred to, is urge-d rearwardly by a helicalspring I9 located within the magazine I3 and also extending within thesaid follower. The said spring I 9 abuts at its forward end against thebody-member of a device which, for convenience of description, may bereferred to as a capacity-adjuster, inasmuch as its position within thetubular magazine I3 will determine how many cartridges may be insertedinto the said magazine from the rear end thereof in the usual manner offirearms of the type illustrated.

The body-member 20, just above referred to,

may be made of any suitable material, though aluminum or other availablelight material is preferred. The said body-member is formed with adiametrically-arranged slot 2| extending from one side of its peripheryto a point adjacent the other side of the said periphery, thus virtuallydividing the body-member into two halves, which are attached togetheronly by a relativelythin and flexible web-portion 22 (Figs. 6 and 7) Atright angles to the deep slot 2|, the body-member is provided on itsrespective opposite sides with relatively-shallow notches 2323. As thusslotted, the body-member 20 may be characterized as expansible, and itsnormal unexpanded size is such that it may be inserted into the interiorof the magazine I3 with a convenient sliding t.

Intermediate the web 22 and one of the adjacent shallow slots 23, thebody-member 2|) is provided in its periphery with an arcuate groove 24,

the bottom wall 25 of which provides a cam-V surface coacting with alocking-roller 26. The depth of the groove 24 and the diameter of thelocking-roller 26 are such that when the said roller is in the centralportion of the said groove, it will not project bey-ond the periphery ofthe body-member to a degree sucient to interfere with the axial slidingof the bodymember in the interior of the magazine I3.

The central portion of the locking-roller 26 is formed with an annulargroove 2l! to clear a retaining-spring or clip 28, which is slightlymore than semi-circular in form and nts within an annular groove 29formed in the periphery of the body-member 23. The retaining-spring orclip 23 serves to prevent the locking-roller 2S from separating from thebody-member when the entire device is outside of the magazine, and doesnot interfere with the lateral movementl ofl the said locking-roller, asmay be required to discharge its locking function and as will be morefully hereinafter described.

The body-member 20 is formed with an axially-arranged conical bore 30terminating at its rear end in a threaded portion 3I of cylindricalform. The threaded portion 3| of the body is engaged by theexteriorly-threaded cylindrical portion 32 of a tubular expander 33having an axial passage 36 extending therethrough, and having theforward portion of its exterior surface 35 of conical form for coactionwith the conical bore 33 of the body-member 23. To limit the f'orwardmovement of the tubular expander 33 with respect to the body-member 2U,the said expander is provided with a transverse stop-pin 36 at its rearend.

At diametrically-opposite points in its forward end, the tubularexpander 33 is preferably provided with L-shaped or bayonet slots3'I-3`I for the reception of the respective opposite ends of acoupling-pin 38 mounted diametrically adjacent one end of a rod-liketool 33 (Fig. 9) having an offsetting handle @Il by means of which itmay be turned.

With the tubular expander 33 retired into the position in which it isindicated by broken lines in Fig. 5, the capacity-adjusted, comprisingin the main the parts 23, 26, 28 and 33, may be inserted into theinterior of the magazine I3, from the forward end thereof, after themagazinehead 3! has been removed therefrom. Once inserted, as justdescribed, the coupling-pin 38 of the rod-like tool 39 may be engagedwith the bayonet slots 37-31 at the forward end of the tubular expander33 and the entire device pushed forwardly to the desired position bymeans of such tool. When the capacity-adjuster is positioned as desired,a right-hand turning of the tool 39 will serve to thread the tubularexpander 33 rearwardly into the body-member 20 to expand the same so asto tightly engage its periphery with the interior surface of themagazine I3. During this operation of threading the tubular expander 33into the body-member 23, the latter will be prevented from rotating bythe locking-roller 26, which, upon the initial turning movement of thebody-member, will become wedged between the adjacent wall of themagazine I3 and the cam-surface 25 of the said bodymember.

Thus, the magazine I3 may have its cartridgecontaining capacityconveniently changed, inasmuch as the position of the capacity-adjusterwithin the said magazine will determine how many cartridges of a givenlength can be inserted into the rear end of the said magazine before theforward movement of the follower I8 is checked by the body-member 20.

Should it be desired to remove the capacityadjusted from the tubularmagazine, the coupling-pin 38 of the rod-like tool 39 may be engagedwith the bayonet slots 3'l-3 of the tubular expander 33 and the saidexpander turned to the left to thus thread the same forwardly withrespect to the body-member 20 and permit the latter to diametricallycontract to permit axial movement. During the operation just described,the locking-roller 26 will function with a wedgelike action andeffectively prevent any appreciable turning of the body-member 20 withinthe magazine, to thus insure that the expander 33 will turn with respectto the body-member 20.

When the body-member 2li has been collapsed, by the operation abovedescribed, sufficiently to free its grip upon the interior of thetubular magagine I3, the entire device may be withdrawn from the saidmagazine by means of the tool 39, the pin 38 of which latter will be atthis time located in the transverse reaches of the respective bayonetslots 51-5'I.

Should it be desired to shift the capacity-adjusting device withinVVYthe tubular magazine I3 after it has once been installed therein, thetool 3S may be inserted, for this purpose, through an opening 42extending through the magazinehead Il (Fig. 3) For convenience insetting the capacity-adjusting device, the tool 39 may be marked as at43 (Fig. 9). Thus, in the particular instance shown, when thecapacity-adjusting device is shifted by means of the tool 39, and themark 3 nearest the pin 38 of the latter is aligned with the front faceof the magazine-head M, and the device then locked, the normalcartridgecontaining capacity of the magazine I3 will be reduced by onecartridge and so on.

Thus, in a simple and effective manner, the present invention providesfor the altering or regulating of the cartridge-retaining capacity of atubular magazine.

The invention may be carried out in other specific ways than that hereinset forth without departing from the spirit and essentialcharacteristics of the invention, and the present embodiment is,therefore, to be considered in all respects as illustrative and notrestrictive, and all changes coming within the meaning and equivalencyrange of the appended claims are intended to be embraced therein.

I claim:

l. In a capacity-adjusting device for tubularmagazine repeatingfirearms, the combination with an expansible member adapted to t withinand grip the interior surface of a tubular magazine; of expanding meansmovable relative to the said expansible member and constructed andarranged to expand the same into gripping engagement with the interiorsurface of a tubular magazine when moved relative to the said eX-pansible member; and locking-means engageable with the magazine andserving to hold the said expansible-member with respect thereto when thesaid expanding means is moved relative to the said expansible-member. f

2. In a capacity-adjusting device for tubularmagazine repeatingfirearms, the combination with an expansible member adapted to t withinand grip the interior surface of a tubular magazine; of expanding meansrotatable relative to the said expansible member and constructed andarranged to expand the same into gripping engagement with the interiorsurface of a tubular magazine when rotated relative to the saidexpansible member; and locking-means operable upon an initial turningmovement of the said expansible member to hold the same against furtherturning movement.

3. In a capacity-adjusting device for tubularmagazine repeatingfirearms, the combination with an expansible member adapted to fitwithin and grip the interior surface of a tubular magazine, and having atapered bore; of4 an expanding member having a portion engaging thetapered bore of the said expansible member and movable relative theretoto expand the same into gripping engagement with the interior surface ofa tubular magazine when moved relative to the said expansible member;and locking-means engageable with the magazine and serving to hold thesaid expansible-member with respect thereto when the said expandingrmeans is moved relative to the said expansible-member.

4. In a capacity-adjusting device for tubularmagazine repeatingfirearms, the combination with an expansible member adapted to lt withinand grip the interior surface of a tubular magazine, and provided with abore having a tapered portion and a threaded portion; of a rotaryexpanding member having a threaded portion engageable with the threadedportion of the bore in the said expansible member and having a portioncoacting with the tapered portion thereof to expand the same intogripping engagement with the interior surface of, a tubular magazinewhen rotated relative to the said expansible member; and locking-meansengageable with the magazine and serving to hold the saidexpansiblemember with respect thereto when the said expanding means ismoved relative to the said expansible-member.

5. In a capacity-adjusting device for tubularmagazine repeatingfirearms, the combination with an expansible member adapted to t withinand grip the interior surface of a tubular magazine, and provided with abore having a tapered portion and a threaded portion; of a rotaryexpanding member having a threaded portion engageable with the threadedportion of the bore in the said expansible member and having a portioncoacting with the tapered portion thereof lto expand the same intogripping engagement with the interior surface of a tubular magazine whenrotated relative to the said expansible member; and locking-meansoperable upon a relatively-slight turning movement of the saidexpansible member to hold the same against further turning movement.

6. In a capacity-adjusting device for tubularmagazine repeatingfirearms, the combination with an expansible member provided in itsouter periphery with an inclined cam-surface and adapted to fit withinand grip the interior surface of a tubular magazine; ofarollinglocking-member engaged by the cam-surface of the said expansiblemember and adapted to be moved outwardly thereby into engagement withthe interior surface of a tubular magazine when effort is made to turnthe said expansible member Within the latter; and expanding meansrotatable relative to the said expansible member and constructed andarranged to expand the same into gripping engagement with the interiorsurface of a tubular magazine when rotated relative to the saidexpansible member.

7. In a capacity-adjusting device for tubularmagazine repeatingfirearms, the combination with an expansible member provided in itsouter periphery with an inclined cam-surface and adapted to t within andgrip the interior surface of a tubular magazine; of a rollinglockingmember engaged by the cam-surface of the said expansible memberand adapted to be wedged by the said cam-surface into engagement withthe interior surface of a tubular magazine when effort is made to turnthe said expansible member within the latter; expanding means rotatablerelative to the said expansible member and constructed and arranged toexpand the same into gripping engagement with the interior surface of. atubular magazine when rotated relative to the said expansible member;and means holding the said locking-member against accidental separationfrom the said expansible member.

8. In a capacity-adjusting device for tubularmagazine repeatingfirearms, the combination with an expansible member provided in itsouter periphery with an inclined cam-surface and adapted to fit withinand grip the interior surface of a tubular magazine; of a locking-rollerengaged by the cam-surface of the said expansible member and adapted tobe moved outwardly thereby into engagement with the interior surface ofa tubular magazine when effort is made to turn the said expansiblemember within the latter; and expanding means rotatable relative to thesaid expansible member and constructed and arranged to expand the sameinto gripping engagement with the interior surface of a tubular magazinewhen rotated relative to the said expansible member.

9. In a capacity-adjusting device for tubularmagazine repeatingfirearms, the combination with an expansible member provided in itsouter periphery with an inclined cam-surface and adapted to t within andgrip the interior surface of a tubular magazine; of a locking-rollerengaged by the cam-surface of the said expansible member and adapted tobe moved outwardly thereby into engagement with the interior surface ofa tubular magazine when effort is made to turn the said expansiblemember within the latter; expanding means rotatable relative to the saidexpansible member and constructed and arranged to expand the same intogripping engagement with the interior surface of a tubular magazine whenrotated relative to the said expansible member; and means serving tohold the said locking-roller in assembled relationship with respect tothe said expansible member.

10. In a capacity-adjusting device for tubularmagazine repeatingfirearms, the combination with an expansible member provided in itsouter periphery with an inclined cam-surface and adapted to t within andgrip the interior surface of a tubular magazine; of a cylindricallockingroller engaged by the cam-surface of the said expansible memberand adapted to be moved outwardly thereby into engagement with theinterior surface of a tubular magazine when effort is made to turn thesaid expansible member within the latter; expanding means rotatablerelative to the said expansible member and constructed and arranged toexpand the same into gripping engagement with the interior surface of atubular magazine when rotated relative to the said expansible member;and a resilient clip embracing a portion of the said expansible memberand holding the said locking-roller against accidental separation fromthe said expansible member.

l1. In a capacity-adjusting device for tubularmagazine repeatingfirearms,` the combination with an expansible member provided in itsouter periphery with a reversely-sloping cam-surface and with aclip-receiving groove, and adapted to fit within and grip the interiorsurface of a tubular magazine; of a locking-roller having an annulargroove and engaged by the reversely-sloping cam-surface of the saidexpansible member and adapted to be moved outwardly thereby intoengagement with the interior surface of the tubular magazine when effortis made to turn the said expansible member Within the latter; expandingmeans rotatable relative to the said expansible member and constructedand arranged tol expand the same into gripping engagement with theinterior surface of a tubular magazine when rotated relative to the saidexpansible member; and a yresilient clip tting Within the clip-receivinggroove of the said expansble member and extending through the annulargroove in the said looking-roller and serving to hold the latter inassembled relationship With respect to the said expansible member.

CHARLES E. BLIZARD.

